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What are the recommended coating methods and points to note?

Latest Updated:04/01/2007

Question:

I am considering applying a moisture-proof coating to my device after mounting it on the board. Can you recommend coating methods, and are there any points I should note when doing this?

Answer:

Renesas Electronics uses an epoxy resin for the packages of semiconductor devices. Make sure that the coating material has an equivalent thermal expansion coefficient to the epoxy resin, so that it does not cause mechanical stress.

Common practice is to apply a (rubber-like) buffer agent before applying the external coating to avoid causing thermal or mechanical stress.

Caution RF & microwave device characteristics may be degraded by the coating processing.
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